US10914910B2 - Sight glass - Google Patents
Sight glass Download PDFInfo
- Publication number
- US10914910B2 US10914910B2 US15/744,633 US201715744633A US10914910B2 US 10914910 B2 US10914910 B2 US 10914910B2 US 201715744633 A US201715744633 A US 201715744633A US 10914910 B2 US10914910 B2 US 10914910B2
- Authority
- US
- United States
- Prior art keywords
- frame
- window
- mating surface
- sight glass
- mating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
- 239000011521 glass Substances 0.000 title claims abstract description 98
- 230000013011 mating Effects 0.000 claims description 56
- 238000000034 method Methods 0.000 claims description 19
- 229920000642 polymer Polymers 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 239000007769 metal material Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 2
- 235000013305 food Nutrition 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 235000014168 granola/muesli bars Nutrition 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/007—Pressure-resistant sight glasses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/004—Sight-glasses therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M11/00—Safety arrangements
- F23M11/04—Means for supervising combustion, e.g. windows
- F23M11/042—Viewing ports of windows
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/02—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by gauge glasses or other apparatus involving a window or transparent tube for directly observing the level to be measured or the level of a liquid column in free communication with the main body of the liquid
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
Definitions
- the sight glass has its origins with steam processes and has been used on boilers and engines to observe water levels.
- Early sight glasses mostly consisted of simple glass tubes attached to a boiler.
- Modern day sight glasses also known as sight windows
- Contemporary versions of sight glasses may be categorized as glass disc sight glasses or fused glass sight glasses.
- Glass disc sight glasses have glass discs that are held between metal frames and are secured with bolts and gaskets to create a seal.
- Fused glass sight glasses have glass that is fused or hermetically sealed to a metal frame and the seal does not necessarily require the use of bolts or gaskets.
- Fused sight glass processing often mechanically pre-stresses the glass by compressing it, and thereby increasing its strength.
- Soda lime and borosilicate are the two most common types used. Soda lime is the least expensive of the two and it provides optical clarity. Borosilicate, on the other hand, also tolerates high temperatures and is resistant to chemical corrosion and thermal shock, while maintaining its optical clarity. In addition, borosilicate has a lower coefficient of thermal expansion than many other glasses. Therefore it is able to withstand more significant pre-stressing, thereby increasing its strength more significantly.
- sight glasses with glass lenses are not always acceptable because glass can chip without complete failure and therefore can go unnoticed in applicable processes.
- One non-limiting application of a polymer sight glass window is in the manufacture of foods such as jams, granola bars, and other foods. There is a zero tolerance for glass in these applications, since glass chips can never be found in the final product. Therefore, there is a need for a safe, strong, and optically clear alternative to glass disc and fused glass sight glasses used in industry. Polymer windows will not chip and therefore are best for use in food manufacturing plants and other applications requiring the use of these devices.
- a sight glass meant for use in process observation in various industrial applications may have an optically clear polymer instead of glass.
- the optically clear polymer may be placed within a rigid frame, allowing a user to safely and clearly view processes of interest without disrupting the processes.
- the polymers used in the sight glass may withstand significant processing pressures which may be maximized through optimal geometric design of a lens frame in which it is installed.
- the geometry of the sight glass may be such that the polymer of the sight glass is the only material to come into contact with the process being viewed through the sight glass.
- the present disclosure includes a device that is similar to a fused glass-style sight glass that uses non-glass windows or optically clear polymers instead of glass.
- the internal geometry of the sight glass allows a polymer to withstand high pressures, while maintaining its integrity.
- the polymer can be selected to meet a wide variety of application requirements.
- a frame mating surface may be generally conical, providing a surface to which a window mating surface mates with the frame mating surface, securing the window against the frame when pressure is applied against the window surface.
- the window may also have a bulbous, square, rectangular or otherwise shaped region that mates within a frame groove in the frame mating surface.
- the frame could be constructed and arranged such that a part of it is exposed to an internal volume of a vessel to which the subject sight glass is mounted.
- the frame could be made of non-metallic materials such as plastics that have sufficient mechanical properties, such as PEEK (Polyether ether ketone), for example.
- a sight glass window may be made from a polymer, or another non-glass material.
- the window is optically clear.
- the window can act as a light filter, allowing infrared light to pass while blocking visible light, for example.
- the window may be made of a colored material in accordance with the preferences of the users. The window clarity and its light filtration properties may be chosen to meet the particular requirements of the process being viewed or the preferences of the users, depending upon the process and what the viewing is expected to accomplished through the window.
- FIG. 1 is a cross-sectional view of a sight glass with a non-glass window.
- FIG. 2 is a cross-sectional view of an interface between a sight glass mounted to a process vessel.
- FIG. 3 is a cross-sectional view of a sight glass with a non-glass, generally conically-shaped window within a likewise shaped frame.
- FIG. 4 is a cross-sectional view of an alternate embodiment of a sight glass with a non-glass window.
- Embodiments of the present invention relate to the use of polymer or other non-glass material, and unique geometry within a fused glass style sight glass.
- FIG. 1 shows sight glass 10 having an optically clear window 12 placed inside of metal frame 14 , with frame slot 16 and frame groove 18 cut or formed into frame mating surface 20 which mirrors window mating surface 21 .
- First surface 24 opposes second surface 13 of window 12 .
- the window material can be chosen to suit specific application requirements, such as being able to withstand higher temperatures or pressures or to be FDA food safe.
- one non-limiting embodiment of sight glass 10 is for use in the manufacture of foods such as jam, granola bars, and other foods.
- Non-chipping polymer window 12 allows sight glass 10 to be used where glass windows are not acceptable.
- Frame mating surface 20 and window mating surface 21 secure window 12 within frame 14 , allowing the window to withstand high pressures applied from a potential process or processes being observed through sight glass 10 .
- Pressure 22 is applied against first surface 24 of window 12 which, in turn, presses against frame mating surface 20 and window mating surface 21 of sight glass 10 .
- Window rim 26 overlaps frame slot 16 so that window 12 is pushed securely against frame 14 around the periphery of window 12 .
- window 12 features a bulbous shaped region 28 which mirrors frame groove 18 helping to secure window 12 within frame 14 , maximizing the pressure resistance of sight glass 10 .
- Gasket 30 secures a portion of first surface 24 of window 12 to help maintain a secured and sealed position within frame 14 .
- FIG. 2 A non-limiting application for sight glass 10 is depicted in FIG. 2 .
- Vessel 32 with interior surface 34 has a ferrule 36 that is constructed to mate with frame 14 and its gasket 30 to form sanitary connection 38 , although a sanitary fitting is not shown for the sake of clarity.
- Window first surface 24 is the only part of sight glass 10 that is exposed to any processes occurring within vessel internal volume 39 .
- FIG. 3 shows sight glass 40 with generally conically-shaped window 42 and frame 44 constructed and arranged to fit window 42 .
- gasket 46 is shown overlapping first surface 48 of window 42 , although gasket 46 may not be necessary.
- Pressure 49 is applied from the process being observed against window first surface 48 , further pressing window 42 against frame 44 .
- FIG. 4 shows sight glass 50 having frame 54 with threaded plug-like extension 56 .
- This embodiment shows sight glass 50 with window 52 mounted in frame 54 , and threaded extension 56 that is sized and shaped to interface with a threaded port of some process vessel or the like. Extension 56 may or may not be intrinsic to the frame 54 .
Abstract
Description
Claims (23)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/744,633 US10914910B2 (en) | 2016-02-22 | 2017-02-22 | Sight glass |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201662298172P | 2016-02-22 | 2016-02-22 | |
US15/744,633 US10914910B2 (en) | 2016-02-22 | 2017-02-22 | Sight glass |
PCT/US2017/018880 WO2017147154A1 (en) | 2016-02-22 | 2017-02-22 | Sight glass |
Publications (2)
Publication Number | Publication Date |
---|---|
US20180203201A1 US20180203201A1 (en) | 2018-07-19 |
US10914910B2 true US10914910B2 (en) | 2021-02-09 |
Family
ID=59686511
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/744,633 Active 2037-05-02 US10914910B2 (en) | 2016-02-22 | 2017-02-22 | Sight glass |
Country Status (6)
Country | Link |
---|---|
US (1) | US10914910B2 (en) |
EP (1) | EP3419745A4 (en) |
CN (1) | CN108712930B (en) |
CA (1) | CA3012488A1 (en) |
MX (1) | MX2018009320A (en) |
WO (1) | WO2017147154A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023220585A1 (en) | 2022-05-09 | 2023-11-16 | L.J. Star, Inc. | Method to measure levels at a vessel outlet and pivotable sensor to carry out the method |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018131800B4 (en) * | 2018-12-11 | 2022-03-03 | Auma Riester Gmbh & Co. Kg | Sight glass, housing, actuator and use of a sight glass |
US11237338B2 (en) * | 2019-12-27 | 2022-02-01 | Lumentum Operations Llc | Optical element holder with a protruding feature to hold a chamfered optical element |
Citations (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3277713A (en) | 1965-02-23 | 1966-10-11 | Thomas R Demyon | Radiator sight gauge |
US3373610A (en) * | 1963-10-02 | 1968-03-19 | Tepro Technical Production Com | Sight window for machines and containers |
US3977251A (en) | 1973-11-02 | 1976-08-31 | Meginnis Charles E | Sight glass assembly |
US4162826A (en) * | 1978-03-20 | 1979-07-31 | Sybron Corporation | Sight glass assembly and method for its production |
US4807474A (en) * | 1986-01-21 | 1989-02-28 | Pressure Products Company, Inc. | Sight glass assembly |
DE4041816A1 (en) | 1990-12-24 | 1992-06-25 | Linnemann Friedrich | Sight glass fitting - has transparent disc with inclined coupling surface engaged by similar surface of counterposed flange |
US5125269A (en) * | 1991-10-15 | 1992-06-30 | Regal Plastics Supply Of Omaha | Sight glass |
US5127433A (en) | 1990-04-19 | 1992-07-07 | Long Manufacturing Ltd. | Coolant corrosiveness indicator |
US5243929A (en) | 1991-09-24 | 1993-09-14 | Clark-Reliance Corporation | Tubular sanitary sight indicator |
US5974877A (en) * | 1996-05-01 | 1999-11-02 | Food Engineering Corporation | Sight window assembly and method of forming same |
US6212989B1 (en) * | 1999-05-04 | 2001-04-10 | The United States Of America As Represented By The Secretary Of The Army | High pressure, high temperature window assembly and method of making the same |
US6404560B1 (en) * | 1999-07-28 | 2002-06-11 | Nikon Corporation | Pressure proof optical apparatus |
US20020189554A1 (en) | 2001-06-15 | 2002-12-19 | Jurgen Kohler | Modular stamped sight glass assembly |
US6567224B2 (en) * | 2000-06-19 | 2003-05-20 | Alps Electric Co., Ltd. | Optical element having integrated optical lens and lens holder, and production method therefor |
US6639745B1 (en) * | 2002-06-25 | 2003-10-28 | Kuo-Chung Cheng | Observation window of a hyperbaric chamber |
US20040187522A1 (en) * | 2003-03-25 | 2004-09-30 | Alps Electric Co., Ltd. | Method for making holder/optical-element assembly |
US6938481B2 (en) * | 1999-06-15 | 2005-09-06 | Emerson Electric Co. | Sight glass and low temperature method of manufacturing the same |
US20100053786A1 (en) * | 2008-09-02 | 2010-03-04 | Peter Schachinger | Sight glass assembly |
US8049978B1 (en) * | 2011-01-22 | 2011-11-01 | Cheng-Wei Su | Assembling structure for a magnifying glass |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NZ213742A (en) * | 1985-10-08 | 1988-02-12 | Lincoln College | Inspection window |
CN2699255Y (en) * | 2004-04-23 | 2005-05-11 | 长丰泰塑胶五金制品(深圳)有限公司 | Stainless steel container water level observation window |
EP2735900A1 (en) * | 2012-11-21 | 2014-05-28 | High Q Laser GmbH | Support mechanism for an optical element and method for adjusting an optical element |
-
2017
- 2017-02-22 MX MX2018009320A patent/MX2018009320A/en unknown
- 2017-02-22 EP EP17757124.7A patent/EP3419745A4/en active Pending
- 2017-02-22 US US15/744,633 patent/US10914910B2/en active Active
- 2017-02-22 WO PCT/US2017/018880 patent/WO2017147154A1/en active Application Filing
- 2017-02-22 CN CN201780010493.9A patent/CN108712930B/en active Active
- 2017-02-22 CA CA3012488A patent/CA3012488A1/en active Pending
Patent Citations (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3373610A (en) * | 1963-10-02 | 1968-03-19 | Tepro Technical Production Com | Sight window for machines and containers |
US3277713A (en) | 1965-02-23 | 1966-10-11 | Thomas R Demyon | Radiator sight gauge |
US3977251A (en) | 1973-11-02 | 1976-08-31 | Meginnis Charles E | Sight glass assembly |
US4162826A (en) * | 1978-03-20 | 1979-07-31 | Sybron Corporation | Sight glass assembly and method for its production |
US4807474A (en) * | 1986-01-21 | 1989-02-28 | Pressure Products Company, Inc. | Sight glass assembly |
US5127433A (en) | 1990-04-19 | 1992-07-07 | Long Manufacturing Ltd. | Coolant corrosiveness indicator |
DE4041816A1 (en) | 1990-12-24 | 1992-06-25 | Linnemann Friedrich | Sight glass fitting - has transparent disc with inclined coupling surface engaged by similar surface of counterposed flange |
US5243929A (en) | 1991-09-24 | 1993-09-14 | Clark-Reliance Corporation | Tubular sanitary sight indicator |
US5125269A (en) * | 1991-10-15 | 1992-06-30 | Regal Plastics Supply Of Omaha | Sight glass |
US5974877A (en) * | 1996-05-01 | 1999-11-02 | Food Engineering Corporation | Sight window assembly and method of forming same |
US6212989B1 (en) * | 1999-05-04 | 2001-04-10 | The United States Of America As Represented By The Secretary Of The Army | High pressure, high temperature window assembly and method of making the same |
US6938481B2 (en) * | 1999-06-15 | 2005-09-06 | Emerson Electric Co. | Sight glass and low temperature method of manufacturing the same |
US6404560B1 (en) * | 1999-07-28 | 2002-06-11 | Nikon Corporation | Pressure proof optical apparatus |
US6567224B2 (en) * | 2000-06-19 | 2003-05-20 | Alps Electric Co., Ltd. | Optical element having integrated optical lens and lens holder, and production method therefor |
US20020189554A1 (en) | 2001-06-15 | 2002-12-19 | Jurgen Kohler | Modular stamped sight glass assembly |
US6499439B1 (en) * | 2001-06-15 | 2002-12-31 | Triad Metal Products Company | Modular stamped sight glass assembly |
US6639745B1 (en) * | 2002-06-25 | 2003-10-28 | Kuo-Chung Cheng | Observation window of a hyperbaric chamber |
US20040187522A1 (en) * | 2003-03-25 | 2004-09-30 | Alps Electric Co., Ltd. | Method for making holder/optical-element assembly |
US20100053786A1 (en) * | 2008-09-02 | 2010-03-04 | Peter Schachinger | Sight glass assembly |
US8049978B1 (en) * | 2011-01-22 | 2011-11-01 | Cheng-Wei Su | Assembling structure for a magnifying glass |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023220585A1 (en) | 2022-05-09 | 2023-11-16 | L.J. Star, Inc. | Method to measure levels at a vessel outlet and pivotable sensor to carry out the method |
Also Published As
Publication number | Publication date |
---|---|
US20180203201A1 (en) | 2018-07-19 |
CN108712930B (en) | 2021-08-31 |
EP3419745A1 (en) | 2019-01-02 |
MX2018009320A (en) | 2019-02-20 |
CA3012488A1 (en) | 2017-08-31 |
CN108712930A (en) | 2018-10-26 |
WO2017147154A1 (en) | 2017-08-31 |
EP3419745A4 (en) | 2019-10-09 |
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